If you recieve the message "No Interpretation Available", that means you are using Wolfram|Alpha through Mathematica. This means there is an orange equal sign left of your code. T
When typing out Mathematica code, you will want this to evaluate directly in Mathematica instead. When this is done, there is no orange equal sign to the left of your code. To evaluate a command directly in Mathematica, open a new notebook and type directly into it.
If you are not sure how to evaluate expressions in Mathematica, please try going through the Mathematica virtual book
to learn more about the basics of using Mathematica.
First, begin by going to the documentation for Solve and try evaluating some of the examples. Do you have any problems doing this? Try making some changes to the examples in the documentation for Solve and evaluating them.